Screened electrical plug connector

Details Screened electrical plug connector Screened electrical plug connector

1999-08-26

2001-10-23

Nguyen, Khiem (Department: 2839)

Electrical connectors

Electromagnetic or electrostatic shield

Shielding individually surrounding or interposed between...

C439S341000

Reexamination Certificate

active

06305983

ABSTRACT:

The invention concerns a screened electrical plug connector for surface mounting on printed circuit boards, consisting of an insulating plug housing, in which electrical connection elements are arranged, which are provided for making contact with contacts of a complementary plug connector, with terminals for connection to printed conductors of a printed circuit board, wherein at least one side of the plug housing is provided with a screening plate that has a contact edge for making contact with grounded printed conductors of a printed circuit board.
The screening of electrical plug-and-socket connections is necessary for improvement of the transmission power levels (HF characteristics) as well as for extensive reduction of particular interference signals such as those from external sources.
The screening of surface-mounted plug connectors is very cumbersome. It is in fact not possible to solder a screened SMD plug connector in a soldering plant for surface soldering technology. The thermal radiation that is needed for soldering the contacts would be reflected by the screening. Consequently, during the handling of SMD plug connectors it is first necessary to position the plug connector without its screening on a printed circuit board by means of a printed circuit board assembly machine and to solder the completely assembled printed circuit board in a further operating process. Only after this is the screening fitted and soldered in an additional manual or mechanical operating step.
A board edge connector that is not intended for surface mounting, but is press-fitted into the printed circuit board together with the screening plate using a conventional press-fit technique, is disclosed by DE 196 40 847 A1. For this purpose the screening plate is fitted with a press-fit contact pin that has to be press-fitted into the printed circuit board with which contact is to be made. In this way the screening plate is permanently connected on one side to the printed circuit board. On the opposite side the screening plate is inserted in undercut form into the plug housing.
The object of the invention is to develop a plug connector of the type described at the outset, to the effect that a screening plate is provided on the plug connector and can be connected to grounded printed conductors of a printed circuit board without the cumbersome soldering or press-fitting processes being necessary.
This object is achieved with a screened electrical plug connection of the type described at the outset, in that the screening plate has a retaining edge opposite the contact edge for attachment to the plug housing, and that the screening plate is locked to the plug housing at a distance from the retaining edge. The screening plate is thus no longer soldered to the printed circuit board, but is retained at the plug housing on the one hand by means of the retaining edge and on the other hand by being locked at a distance from the retaining edge. The screening plate can be simply clipped to the plug housing in this manner. Contact with the grounded printed conductors of the printed circuit board is achieved automatically when the screening plate is snapped into its final position on the plug housing, either by the contact edge coming directly into contact with the grounded printed conductors of the printed circuit board, or with contact parts that are connected to the printed conductors.
According to one embodiment of the invention, the screening plate is inserted into pockets in the plug housing at one side of the retaining edge and locked at the side of the contact edge by means of openings in the housing, that are formed in the contact edge, which is bent through 90°, and engage the locking hooks that are provided in the plug housing, preferably in a pocket. The contact edge can be fitted either with spring contact lugs which make direct contact with the grounded printed conductors of the printed circuit board, or, according to a different embodiment, the contact edge can also engage contact elements that are in electrical contact with the earthed printed conductors of the printed circuit board.
According to another embodiment of the invention, the screening plate is provided with a folded edge which encloses the side of the plug housing that is provided to accept a complementary plug connector, and is locked to the plug housing by means of locking lugs in the region of the opposite side of the plug housing. The contact edge has cut-outs which engage screening contacts which were, for example, soldered to the grounded printed conductors at the same time as the plug connector was soldered.
All types of embodiment offer the advantage that several variants of a screened plug connector can be adapted to the conditions of the printed circuit board economically and in a simple and problem-free manner.
A further advantage is that, optionally, either a single-sided or multi-sided screening plate can be employed, in which case the screening plate can be merely pushed on and makes contact with the printed circuit board via suitable contact elements.
Advantageous developments of the invention are stated in the sub-claims.


REFERENCES:
patent: 4968261 (1990-11-01), Mizunuma
patent: 5030140 (1991-07-01), Sugiyama
patent: 5104341 (1992-04-01), Gilissen et al.
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